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  "path": "/article/new-particle-mass-measurement-deepens-quantum-mystery/",
  "publishedAt": "2026-04-10T16:00:00.000Z",
  "site": "https://www.scientificamerican.com",
  "textContent": "A new calculation helps narrow down the mass of the W boson, one of the heaviest fundamental particles in the universe",
  "title": "New particle mass measurement deepens quantum mystery"
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